<meta charset="utf-8">
<select>
          <script>
                  var a=["鼠","牛","虎","兔","龙","蛇","马","羊","猴","鸡","狗","猪"];
                  for(var i=0;i<a.length;i++){ 
                           document.write("<option>"+a[i]+"</option>");        
                  }
         </script>
</select>